Thanks again to the venerable JBQ of Google, the unmodified factory image of Android 4.0.4 for the Nexus S 4G (sojus, Android 4.0.4 IMM76D) is now available here. As JBQ states on Google+, this image is for those among you who have flashed to custom versions of AOSP and want to get back to factory state. No, by the way, there's still no word on an OTA update yet.